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libstdc++: add casts to from_chars in <charconv> [PR111883]

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This fixes

.../charconv: In function 'std::from_chars_result std::from_chars(const char*, const char*, _Float16&, chars_format)':
.../charconv:687:17: warning: converting to '_Float16' from 'float' with greater conversion rank
  687 |       __value = __val;
      |                 ^~~~~
.../charconv: In function 'std::from_chars_result std::from_chars(const char*, const char*, __gnu_cxx::__bfloat16_t&, chars_format)':
.../charconv:763:17: warning: converting to '__gnu_cxx::__bfloat16_t' {aka '__bf16'} from 'float' with greater conversion rank
  763 |       __value = __val;
      |                 ^~~~~

which was breaking a test:

FAIL: g++.dg/warn/Wstringop-overflow-6.C  -std=gnu++26 (test for excess errors)

	PR testsuite/111883

libstdc++-v3/ChangeLog:

	* include/std/charconv (from_chars): Add explicit casts.
This commit is contained in:
Marek Polacek 2023-10-19 17:48:44 -04:00
parent 24cf1f600b
commit 1d9263f292
1 changed files with 6 additions and 6 deletions
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12
libstdc++-v3/include/std/charconv
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@ -684,7 +684,7 @@ namespace __detail
from_chars_result __res
= __from_chars_float16_t(__first, __last, __val, __fmt);
if (__res.ec == errc{})
__value = __val;
__value = _Float16(__val);
return __res;
}
#endif
@ -697,7 +697,7 @@ namespace __detail
float __val;
from_chars_result __res = from_chars(__first, __last, __val, __fmt);
if (__res.ec == errc{})
__value = __val;
__value = _Float32(__val);
return __res;
}
#endif
@ -710,7 +710,7 @@ namespace __detail
double __val;
from_chars_result __res = from_chars(__first, __last, __val, __fmt);
if (__res.ec == errc{})
__value = __val;
__value = _Float64(__val);
return __res;
}
#endif
@ -723,7 +723,7 @@ namespace __detail
long double __val;
from_chars_result __res = from_chars(__first, __last, __val, __fmt);
if (__res.ec == errc{})
__value = __val;
__value = _Float128(__val);
return __res;
}
#elif defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_HAVE_FLOAT128_MATH)
@ -739,7 +739,7 @@ namespace __detail
__extension__ __ieee128 __val;
from_chars_result __res = from_chars(__first, __last, __val, __fmt);
if (__res.ec == errc{})
__value = __val;
__value = _Float128(__val);
return __res;
}
#else
@ -760,7 +760,7 @@ namespace __detail
from_chars_result __res
= __from_chars_bfloat16_t(__first, __last, __val, __fmt);
if (__res.ec == errc{})
__value = __val;
__value = __gnu_cxx::__bfloat16_t(__val);
return __res;
}
#endif